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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Cumulative impact from accounting change | $ (446) |  |  |  |  | $ (446)
Balance at beginning of period at Dec. 31, 2017 | 2,523,905 | $ 47,555 | $ (430,576) | $ 1,742,419 | $ 2,077 | 1,162,430
Balance (in shares) at Dec. 31, 2017 |  | 475,547 | 14,936 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 117,231 |  |  |  |  | 117,231
Stock amortization and vesting | 302 | $ 53 |  | 249 |  |
Stock amortization and vesting (in shares) |  | 534 |  |  |  |
Purchase of treasury stock | (207,135) |  | $ (207,135) |  |  |
Purchase of treasury stock (in shares) |  |  | 8,328 |  |  |
Cash dividends | (27,647) |  |  |  |  | (27,647)
Other comprehensive income | 306 |  |  |  | 306 |
Balance at end of period at Mar. 31, 2018 | 2,406,516 | $ 47,608 | $ (637,711) | 1,742,668 | 2,383 | 1,251,568
Balance (in shares) at Mar. 31, 2018 |  | 476,081 | 23,264 |  |  |
Balance at beginning of period at Dec. 31, 2018 | 2,088,159 | $ 47,610 | $ (1,334,688) | 1,763,142 | 4,437 | 1,607,658
Balance (in shares) at Dec. 31, 2018 |  | 476,095 | 53,410 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 262,763 |  |  |  |  | 262,763
Stock amortization and vesting | (213) | $ 68 |  | (281) |  |
Stock amortization and vesting (in shares) |  | 682 |  |  |  |
Purchase of treasury stock | (28) |  | $ (28) |  |  |
Cash dividends | (29,605) |  |  |  |  | (29,605)
Other comprehensive income | (137) |  |  |  | (137) |
Balance at end of period at Mar. 31, 2019 | $ 2,320,939 | $ 47,678 | $ (1,334,716) | $ 1,762,861 | $ 4,300 | $ 1,840,816
Balance (in shares) at Mar. 31, 2019 |  | 476,777 | 53,410 |  |  |

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